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runtime: fix TOCTOU issue when decreasing num_idle_threads (#7918)

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ADD-SP
2026-02-17 21:50:26 -08:00
committed by GitHub
parent d83921bc51
commit c23735d43b
1 changed files with 4 additions and 4 deletions
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tokio/src/runtime/blocking/pool.rs
+4 -4
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@@ -568,13 +568,13 @@ impl Inner {
// Thread exit
self.metrics.dec_num_threads();
// num_idle should now be tracked exactly, panic
// `num_idle_threads` should now be tracked exactly, panic
// with a descriptive message if it is not the
// case.
let prev_idle = self.metrics.dec_num_idle_threads();
assert!(
prev_idle >= self.metrics.num_idle_threads(),
"num_idle_threads underflowed on thread exit"
assert_ne!(
prev_idle, 0,
"`num_idle_threads` underflowed on thread exit"
);
if shared.shutdown && self.metrics.num_threads() == 0 {